Abstract
Proton transfer through hydrogen bonds plays a fundamental role in many physical, chemical and biological processes. The complexity of proton dynamics largely arises from nuclear quantum effect in terms of proton tunneling, which tends to involve many hydrogen bonds simultaneously, leading to correlated many-body tunneling. In contrast to the well-studied incoherent single particle tunneling, our understanding of the many-body tunneling, especially the effect of local environment on the tunneling process, is still in its infancy. Here we report the real-space observation of concerted proton tunneling within a hydrogen-bonded water tetramer using a cryogenic scanning tunneling microscope (STM). This is achieved by monitoring in real time the reversible interconversion of the hydrogen-bonding chirality of the cyclic water tetramer with a chlorine-terminated STM tip. Interestingly, we found that the presence of the Cl anion at the tip apex may either enhance or suppress the concerted tunneling process depending on the details of coupling symmetry between the Cl- and the protons. This work opens up the possibility of controlling the quantum states of protons with atomic-scale precision.
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Guo, J. (2018). Concerted Proton Tunneling. In: High Resolution Imaging, Spectroscopy and Nuclear Quantum Effects of Interfacial Water. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-13-1663-0_5
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DOI: https://doi.org/10.1007/978-981-13-1663-0_5
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